EP0212682A1 - Self-diagnosis device and process for a micro-computer control system for a motor-vehicle internal combustion engine - Google Patents
Self-diagnosis device and process for a micro-computer control system for a motor-vehicle internal combustion engine Download PDFInfo
- Publication number
- EP0212682A1 EP0212682A1 EP86200662A EP86200662A EP0212682A1 EP 0212682 A1 EP0212682 A1 EP 0212682A1 EP 86200662 A EP86200662 A EP 86200662A EP 86200662 A EP86200662 A EP 86200662A EP 0212682 A1 EP0212682 A1 EP 0212682A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- micro
- computer
- engine
- self
- sensors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
Definitions
- the present invention relates to a device and a process of self-diagnosis, to verify the functionality of a control system by programmed micro-computer, particularly used to control preselected operative parameters of an internal combustion (i.c.) engine of a vehicle.
- a device and a process of self-diagnosis to verify the functionality of a control system by programmed micro-computer, particularly used to control preselected operative parameters of an internal combustion (i.c.) engine of a vehicle.
- micro-computer systems comprise a central processing unit (CPU), an input unit, an output unit, and memory units formed by permanent memories (ROM) and volatile memories (RAM).
- CPU central processing unit
- ROM permanent memories
- RAM volatile memories
- the input unit is generally operative connected to sensors of engine parameters and outlet unit is operatively connected to the actuators of engine's operative parameters, such as injection and ignition.
- the CPU processes the data entered by the input unit, according to the computation programs stored in permanent memory, and elaborates the signals to be sent to the output unit for actuators' control.
- Purpose of the present invention is to provide a self-diagnosis device and process of micro-computer control systems, particularly efficient and reliable, safe and simple to be used.
- the device and process of self-diagnosis must be suitable to be integrated in microcomputer control system, when this latter is in its operating configuration.
- the present invention provides a self-diagnosis device to verify the functionality of a control system by programmed micro-computer, particularly used for controlling preselected operative parameters of an i.c. engine, wherein said micro-computer is operatively connected to sensors of determined engine parameters and to actuators of determined operative parameters of the same engine, and wherein said self-diagnosis device is provided with means indicating the functional state of said micro-computer, of said sensors and of said actuators, the said device being characterized in that it is provided with connection means operatively connectable to said micro-computer, when this is connected in its turn to said sensors and actuators, said microcomputer being also programmed to execute on command a preestablished sequence of operations of check of the functional state of its components and of said sensors and actuators and to display their state through the said indicator means.
- the said microcomputer is programmed to verify in a first stage the func tional state of its own components, and in further stages, the functional state of preselected sensor and actuator sets, and to correspondingly actuate the said indicator means in subsequent stages.
- the device according to the invention it is hence possible it to verify the functional state of the micro-computer control system, when this is in its operating configuration, in that the test device is operatively connected to said sensors and actuators through the micro-computer, and also in that the test program is executed by the same micro-computer controlling the system's normal operation.
- the device By means of the device, it is moreover possible to test the functional state of individual components, micro-computer, sensors, actuators, to identify with particular reliability the possible cause of system's malfunctioning or fault. This has been accomplished with a limited number of indicator means, because the test program is executed in sequential stages, each of which relates to a determined components' set.
- the invention relates also to a self-diagnostic process for testing the functionality of a control system by programmed micro-computer, particularly used to control preselected operative parameters of an i.c. engine, wherein said micro-computer is operatively connected to sensors of determined engine parameters and to actuators of determined operative parameters of the same engine, the said self-diagnostic process allowing displaying on indicator means the functional state of said micro-computer, of said sensors and of said actuators, the said process consisting in operatively connecting said indicator means to said micro-com puter, when this is connected in its turn to said sensors and to said actuators, in commanding said micro-computer to execute a pre-established sequence of operations of test of the functional state of its components, of said sensors and actuators, and in displaying the functional state thereof by means of the said indicator means.
- the said process consists in commanding said micro-computer to verify in a first stage the functional state of its own components, and in further stages the functional state of preselected sensor and actuator sets, and in correspondingly actuating also the said indicator means in subsequent steps.
- the microcomputer is generally indicated of an ignition and fuel injection control system of a six-cylinder i.c. engine (not shown).
- the microcomputer comprises and input/output unit 11, a microprocessor (CPU) 12, a reading and writing memory (RAM) 13, a permanent, of reading only, memory (ROM) 14.
- CPU central processing unit
- RAM read only memory
- ROM read only memory
- the components of the micro-computer are connected with one another by means of parallel interconnecting lines (bus) 15, 16, 17, respectively for data, for addresses and for the inner control signals.
- bus parallel interconnecting lines
- lines 18, 19, 20, 21, 22 lines enter connected to respective sensors of engine parameters, i.e., temperature of air intaken by the engine, temperature of cooling water of same engine, engine's stroke and revolutions per minute (rpm), feeding air shutter throttle valve(s) angle.
- sensors of engine parameters i.e., temperature of air intaken by the engine, temperature of cooling water of same engine, engine's stroke and revolutions per minute (rpm), feeding air shutter throttle valve(s) angle.
- the data processing programs are stored, to be executed by microprocessor 12 to control engine's injection and ignition.
- the self-diagnostic program for the testing of the system's functionality is contained, and the data necessary for executing the operations started in the same programs are stored.
- the unit 11 can be connected to an indicator device 32 provided with nine warning lights 33, 34, 35, 36, 37, 38, 39, 40, 41, provided to respectively signal the functionality of air temperature sensor, connected to line 18, of water temperature sensor, connected to line 19, of engine stroke sensor, connected to line 20, of engine rpm sensor, connected to line 21, of throttle valve(s) angle sensor, connected to line 22, of ignition coil, connected to line 29, of throttle valve(s) stopper actuator, connected to line 30, and of electroinjectors, connected to lines 23 to 28.
- an indicator device 32 provided with nine warning lights 33, 34, 35, 36, 37, 38, 39, 40, 41, provided to respectively signal the functionality of air temperature sensor, connected to line 18, of water temperature sensor, connected to line 19, of engine stroke sensor, connected to line 20, of engine rpm sensor, connected to line 21, of throttle valve(s) angle sensor, connected to line 22, of ignition coil, connected to line 29, of throttle valve(s) stopper actuator, connected to line 30, and of electroinjectors, connected
- the warning light 41 is provided to verify the current supply, as supplied to the system by the battery (not shown) via a line 42 and a key-switch 43.
- the microprocessor is commanded to interrupt the main program, relating to the injection and ignition control, to switch to the execution of self-diagnostic program.
- the microprocessor After having verified that the system is correctly energized, and hence that warning light 41 is turned on, the microprocessor verifies the functionality of its memories 13 and 14.
- warning lights 33 to 40 of device 32 are commanded to flash, and the operator can visually verify their functional state. If the test gives a positive result, the microprocessor keeps turned on the warning lights, and passes ahead to execute the operations of the program of testing of sensors and actuators connected to unit 11.
- the microprocessor tests the functionality of air tem temperature sensors (line 18), and water temperature sensors (line 19), verifying that the temperature value detected by the sensors is comprised between a pre-established minimum value, and a pre-established maximum value close respectively to the lower and upper limits of sensors' measurement ranges.
- test result is positive, related warning lights 33 and 34 are switched off.
- the microprocessor tests the electrical continuity of ignition coil's circuit, verifying that the load current reaches a pre-established maximum value, and in case of correct operation, switches on the related warning light 38, after having also controlled the coil's discharge, to prevent that the spark may be ignited at spark plugs.
- the microprocessor verifies the electrical continuity of electroinjectors' circuit, verifying that during pre-established time intervals the discharge current reaches preselected threshold values.
- threshold values lower than the values adopted for normal operation are preselected, to avoid the electroinjectors to be opened to uncontrollable fuel supplies.
- test result is positive, related warning light 40 is switched off. If on the contrary the same warning light remains turned on, the microprocessor is able to indicate which injector(s) is (are) malfunctioning, by means of warning lights 33-38, after having completed the test of functionality of all sensors and actuators under test.
- the microprocessor may test the functionality of throttle valve(s) angle sensor, it is necessary that the driver commands the opening thereof; as soon as the microprocessor detects an angular variation in the signal emitted by the sensor, it verifies that the same angular signal has the stated values.
- the microprocessor passes then to test the throttle valve stopper actuator, sending the command signals corresponding to minimum and maximum stroke.
- the warning light 39 is switched off if the test result is positive.
- the driving shaft be made turn, by at least two revolutions, by actuating the starter.
- the microprocessor verifies then that through the line 20 the impulses are present which supply the stroke indication, and that through the line 21 the impulses are present which allow determining engine's turning rate.
- the microprocessor detectes that the warning light 40, relating to the electroinjectors, has remained turned on, it signals which one(s) of same injectors is(are) malfunctioning, by turning on again one or more ones of the first six warning lights 33 to 38.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
- The present invention relates to a device and a process of self-diagnosis, to verify the functionality of a control system by programmed micro-computer, particularly used to control preselected operative parameters of an internal combustion (i.c.) engine of a vehicle.
- Electronic control systems accomplished with micro-computers are being increasingly used in motor-vehicle industry, above all for the control of operative parameters, such as injection and ignition, of i.c. engines.
- These micro-computer systems comprise a central processing unit (CPU), an input unit, an output unit, and memory units formed by permanent memories (ROM) and volatile memories (RAM).
- The input unit is generally operative connected to sensors of engine parameters and outlet unit is operatively connected to the actuators of engine's operative parameters, such as injection and ignition.
- The CPU processes the data entered by the input unit, according to the computation programs stored in permanent memory, and elaborates the signals to be sent to the output unit for actuators' control.
- To avoid errors, and accomplish a satisfactory control of engine's operative parameters, it is necessary that the different system's components operate correctly, remaining within the tolerance prescribed.
- Moreover, in case of system's fault or malfunctioning, it is important that the component(s) causing it may be identified quickly and precisely.
- It is hence suitable that the functional state of system's different components, and in particular of the cri tical ones, can be verified, by means of devices prearranged to that purpose, to be used during the system's overhauling and maintenance operations, or also during engine's normal operation, before it is started.
- Purpose of the present invention is to provide a self-diagnosis device and process of micro-computer control systems, particularly efficient and reliable, safe and simple to be used. In particular, the device and process of self-diagnosis must be suitable to be integrated in microcomputer control system, when this latter is in its operating configuration.
- In view of such a purpose, the present invention provides a self-diagnosis device to verify the functionality of a control system by programmed micro-computer, particularly used for controlling preselected operative parameters of an i.c. engine, wherein said micro-computer is operatively connected to sensors of determined engine parameters and to actuators of determined operative parameters of the same engine, and wherein said self-diagnosis device is provided with means indicating the functional state of said micro-computer, of said sensors and of said actuators, the said device being characterized in that it is provided with connection means operatively connectable to said micro-computer, when this is connected in its turn to said sensors and actuators, said microcomputer being also programmed to execute on command a preestablished sequence of operations of check of the functional state of its components and of said sensors and actuators and to display their state through the said indicator means.
- According to a preferred embodiment, the said microcomputer is programmed to verify in a first stage the func tional state of its own components, and in further stages, the functional state of preselected sensor and actuator sets, and to correspondingly actuate the said indicator means in subsequent stages.
- By means of the device according to the invention, it is hence possible it to verify the functional state of the micro-computer control system, when this is in its operating configuration, in that the test device is operatively connected to said sensors and actuators through the micro-computer, and also in that the test program is executed by the same micro-computer controlling the system's normal operation.
- By means of the device, it is moreover possible to test the functional state of individual components, micro-computer, sensors, actuators, to identify with particular reliability the possible cause of system's malfunctioning or fault. This has been accomplished with a limited number of indicator means, because the test program is executed in sequential stages, each of which relates to a determined components' set.
- The invention relates also to a self-diagnostic process for testing the functionality of a control system by programmed micro-computer, particularly used to control preselected operative parameters of an i.c. engine, wherein said micro-computer is operatively connected to sensors of determined engine parameters and to actuators of determined operative parameters of the same engine, the said self-diagnostic process allowing displaying on indicator means the functional state of said micro-computer, of said sensors and of said actuators, the said process consisting in operatively connecting said indicator means to said micro-com puter, when this is connected in its turn to said sensors and to said actuators, in commanding said micro-computer to execute a pre-established sequence of operations of test of the functional state of its components, of said sensors and actuators, and in displaying the functional state thereof by means of the said indicator means.
- Always according to a preferred embodiment, the said process consists in commanding said micro-computer to verify in a first stage the functional state of its own components, and in further stages the functional state of preselected sensor and actuator sets, and in correspondingly actuating also the said indicator means in subsequent steps.
- Characteristics and advantages of the invention are illustrated hereunder with reference to the attached drawing, wherein a preferred embodiment of the same invention is represented to exemplifying and not limitative purposes, and in schematic way.
- In the single figure, with 10 the microcomputer is generally indicated of an ignition and fuel injection control system of a six-cylinder i.c. engine (not shown).
- The microcomputer comprises and input/output unit 11, a microprocessor (CPU) 12, a reading and writing memory (RAM) 13, a permanent, of reading only, memory (ROM) 14.
- The components of the micro-computer are connected with one another by means of parallel interconnecting lines (bus) 15, 16, 17, respectively for data, for addresses and for the inner control signals.
- Into input/output unit 11
lines - In the
permanent memory 14, the data processing programs are stored, to be executed bymicroprocessor 12 to control engine's injection and ignition. In the same memory, the self-diagnostic program for the testing of the system's functionality is contained, and the data necessary for executing the operations started in the same programs are stored. - From unit 11 the
lines - From unit 11
moreover lines - Through a
connection line 31, the unit 11 can be connected to anindicator device 32 provided with ninewarning lights line 18, of water temperature sensor, connected toline 19, of engine stroke sensor, connected toline 20, of engine rpm sensor, connected toline 21, of throttle valve(s) angle sensor, connected to line 22, of ignition coil, connected toline 29, of throttle valve(s) stopper actuator, connected toline 30, and of electroinjectors, connected to lines 23 to 28. - The
warning light 41 is provided to verify the current supply, as supplied to the system by the battery (not shown) via aline 42 and a key-switch 43. - The operations of self-diagnostic program are executer by
microprocessor 12 when thedevice 32 is connected to unit 11, and the key-switch 43 is turned on. - Under these conditions, the microprocessor is commanded to interrupt the main program, relating to the injection and ignition control, to switch to the execution of self-diagnostic program.
- After having verified that the system is correctly energized, and hence that
warning light 41 is turned on, the microprocessor verifies the functionality of itsmemories - During the test,
warning lights 33 to 40 ofdevice 32 are commanded to flash, and the operator can visually verify their functional state. If the test gives a positive result, the microprocessor keeps turned on the warning lights, and passes ahead to execute the operations of the program of testing of sensors and actuators connected to unit 11. - The microprocessor tests the functionality of air tem temperature sensors (line 18), and water temperature sensors (line 19), verifying that the temperature value detected by the sensors is comprised between a pre-established minimum value, and a pre-established maximum value close respectively to the lower and upper limits of sensors' measurement ranges.
- If test result is positive,
related warning lights - The microprocessor tests the electrical continuity of ignition coil's circuit, verifying that the load current reaches a pre-established maximum value, and in case of correct operation, switches on the
related warning light 38, after having also controlled the coil's discharge, to prevent that the spark may be ignited at spark plugs. The microprocessor verifies the electrical continuity of electroinjectors' circuit, verifying that during pre-established time intervals the discharge current reaches preselected threshold values. - Preferably, threshold values lower than the values adopted for normal operation are preselected, to avoid the electroinjectors to be opened to uncontrollable fuel supplies.
- If test result is positive,
related warning light 40 is switched off. If on the contrary the same warning light remains turned on, the microprocessor is able to indicate which injector(s) is (are) malfunctioning, by means of warning lights 33-38, after having completed the test of functionality of all sensors and actuators under test. - In order that the microprocessor may test the functionality of throttle valve(s) angle sensor, it is necessary that the driver commands the opening thereof; as soon as the microprocessor detects an angular variation in the signal emitted by the sensor, it verifies that the same angular signal has the stated values.
- It results from that, that if sensor is correctly operating, also the
warning light 37 is switched off. - The microprocessor passes then to test the throttle valve stopper actuator, sending the command signals corresponding to minimum and maximum stroke.
- Also in this case, the
warning light 39 is switched off if the test result is positive. - For it to be possible to the microprocessor to test the engine stroke and rpm sensors, it is necessary that the driving shaft be made turn, by at least two revolutions, by actuating the starter.
- The microprocessor verifies then that through the
line 20 the impulses are present which supply the stroke indication, and that through theline 21 the impulses are present which allow determining engine's turning rate. - If the test results are positive, also
warning lights - If, after the stage of said sensor and actuator testing, the microprocessor detectes that the
warning light 40, relating to the electroinjectors, has remained turned on, it signals which one(s) of same injectors is(are) malfunctioning, by turning on again one or more ones of the first sixwarning lights 33 to 38.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8520681A IT1208538B (en) | 1985-05-14 | 1985-05-14 | DEVICE AND SELF-DIAGNOSIS PROCEDURE OF A MICROCALCULATOR CONTROL SYSTEM FOR A C.I.MOTOR OF A VEHICLE. |
IT2068185 | 1985-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0212682A1 true EP0212682A1 (en) | 1987-03-04 |
Family
ID=11170476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86200662A Ceased EP0212682A1 (en) | 1985-05-14 | 1986-04-18 | Self-diagnosis device and process for a micro-computer control system for a motor-vehicle internal combustion engine |
Country Status (3)
Country | Link |
---|---|
US (1) | US4896276A (en) |
EP (1) | EP0212682A1 (en) |
IT (1) | IT1208538B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988005496A1 (en) * | 1987-01-22 | 1988-07-28 | Robert Bosch Gmbh | Process for driving computer-controlled final control elements and computer coupled to a final control element |
DE3911876A1 (en) * | 1988-04-11 | 1989-10-19 | Fuji Heavy Ind Ltd | SELF-DIAGNOSIS SYSTEM FOR MOTOR VEHICLES |
WO1996013657A1 (en) * | 1994-10-29 | 1996-05-09 | Robert Bosch Gmbh | Process and device for controlling the drive unit of a vehicle |
DE102009027923A1 (en) * | 2009-07-22 | 2011-01-27 | Robert Bosch Gmbh | Method for operating a control device |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2819836B2 (en) * | 1991-01-23 | 1998-11-05 | 日産自動車株式会社 | Self-diagnosis device for internal combustion engine |
US5369392A (en) * | 1992-09-16 | 1994-11-29 | Caterpillar Inc. | Method and apparatus for indicating faults in switch-type inputs |
JPH06174600A (en) * | 1992-09-16 | 1994-06-24 | Caterpillar Inc | Method and device for displaying change of state |
US5453939A (en) * | 1992-09-16 | 1995-09-26 | Caterpillar Inc. | Computerized diagnostic and monitoring system |
JP3505760B2 (en) * | 1993-02-18 | 2004-03-15 | 株式会社デンソー | Vehicle self-diagnosis device |
JP3613028B2 (en) * | 1998-10-08 | 2005-01-26 | 株式会社デンソー | Memory check device and check method |
DE19917208A1 (en) * | 1999-04-16 | 2000-10-19 | Bosch Gmbh Robert | Testing of a vehicle computer by supplying test data to one or more program modules so that the results can be checked against expected results and an error condition indicated if necessary |
US6259981B1 (en) | 1999-06-17 | 2001-07-10 | Thomas J. Wilcosky | Caution/warning system for displaying system malfunctions/faults in a night-time viewing mode |
FR2891093B1 (en) * | 2005-09-16 | 2007-10-26 | Schneider Electric Ind Sas | ELECTRONIC TRIGGER WITH MONITORING MEANS, CIRCUIT BREAKER COMPRISING SUCH A TRIGGER AND SURVEILLANCE METHOD. |
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-
1985
- 1985-05-14 IT IT8520681A patent/IT1208538B/en active
-
1986
- 1986-04-18 EP EP86200662A patent/EP0212682A1/en not_active Ceased
- 1986-04-21 US US06/853,959 patent/US4896276A/en not_active Expired - Fee Related
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US3919885A (en) * | 1972-03-24 | 1975-11-18 | Harbeke Gerold J | Apparatus for dynamically analyzing an electronic fuel injection system and the associated engine parts |
US4339801A (en) * | 1979-03-23 | 1982-07-13 | Nissan Motor Company, Limited | Automatic control system for method and apparatus for checking devices of an automotive vehicle in use with a microcomputer |
US4325251A (en) * | 1979-06-28 | 1982-04-20 | Nissan Motor Company, Limited | Apparatus for testing a control system for automotive vehicle |
EP0065703A2 (en) * | 1981-05-13 | 1982-12-01 | Hitachi, Ltd. | Electronic control method and apparatus for internal combustion engine |
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EP0106743A2 (en) * | 1982-09-27 | 1984-04-25 | AlliedSignal Inc. | Switching type circuit for fuel injector |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988005496A1 (en) * | 1987-01-22 | 1988-07-28 | Robert Bosch Gmbh | Process for driving computer-controlled final control elements and computer coupled to a final control element |
US5031177A (en) * | 1987-01-22 | 1991-07-09 | Robert Bosch Gmbh | Method for controlling a computer-final control element and computer coupled with a final control element |
DE3911876A1 (en) * | 1988-04-11 | 1989-10-19 | Fuji Heavy Ind Ltd | SELF-DIAGNOSIS SYSTEM FOR MOTOR VEHICLES |
WO1996013657A1 (en) * | 1994-10-29 | 1996-05-09 | Robert Bosch Gmbh | Process and device for controlling the drive unit of a vehicle |
US5880568A (en) * | 1994-10-29 | 1999-03-09 | Robert Bosch Gmbh | Method and arrangement for controlling the drive unit of a vehicle |
DE102009027923A1 (en) * | 2009-07-22 | 2011-01-27 | Robert Bosch Gmbh | Method for operating a control device |
Also Published As
Publication number | Publication date |
---|---|
US4896276A (en) | 1990-01-23 |
IT1208538B (en) | 1989-07-10 |
IT8520681A0 (en) | 1985-05-14 |
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